Weird? Taillights work in the day but not at night?

[Tubbz]

I have a 93 k1500 the taillights function properly in the day but at night there’s nothing no brake lights or any lights whatsoever only works in the day can someone help me I Have no clue I’ve checked all the fuses are good

 

[Erik the Awful]

I answered your question in the "Stupid Questions" sticky. There's no need to post your question twice.